Update runners to ubuntu-latest

.github/workflows/kotlin.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   gradle:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     concurrency:
       # When running on main, use the sha to allow all runs of this workflow to run concurrently.

.github/workflows/swift.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: macos-14
 
     concurrency:
       # When running on main, use the sha to allow all runs of this workflow to run concurrently.
@@ -19,9 +19,9 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Install Swift
-      uses: slashmo/install-swift@v0.3.0
+      uses: swift-actions/setup-swift@v2
       with:
-        version: 5.7
+        swift-version: "6.1"
 
     - name: Build for Swift
       run: swift build

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.6
+// swift-tools-version: 6.1
 
 import PackageDescription